Rebel, survivor, pinup, sweetheart, pit bull, rock chick, ice queen: female tennis players sure seem to get labeled a lot. And while that kind of media sizzle makes tournaments like Wimbledon a hot ticket, it doesn't begin to sum up the resilience and power of the sport's biggest stars. Find out what drives the greatest players of the past 40 years, from Billie Jean King to Li Na

Justine Henin

Justine Henin’s steely determination and cool demeanor didn’t endear her to the masses, nor did her retiring from the 2006 Australian Open final as a result of intense stomach pain. But even her critics have to respect her sublime one-handed backhand, described by John McEnroe as the best in the women’s or men’s game. Standing at just 5 ft. 5 in., she managed to rise to No. 1 by utilizing her immense speed and precise footwork, which helped her win seven Grand Slam singles titles, including four straight wins at Roland Garros, most recently in 2007. In memory of her mother, who died of cancer when she was 12, Henin, now 29 and retired, runs Justine’s Winners Circle, a charity that grants wishes to children with cancer and assists their families financially.